Analysis of second-harmonic generation of Lamb waves using a combined method in a two-layered solid waveguide

Analysis of second-harmonic generation of Lamb waves using a combined method in a two-layered solid waveguide
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双层固体波导中兰姆波二次谐波产生的组合方法分析

DOI:
10.1063/1.3171942
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发表时间:
2009-07
影响因子:
3.2
通讯作者:
轩福贞
轩福贞
中科院分区:
物理与天体物理3区
文献类型:
--
作者:
项延讯;邓明晰;轩福贞

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在二阶摄动处理中,本文结合模态分析方法和声波在界面处的非线性反射,分析了双层固体波导中兰姆波的复杂二次谐波产生。基于模态分析方法得到了二次谐波场的形式化解,由此可以确定相位匹配修正因子。声波在界面非线性反射得到的累积二次谐波位移场的解可以通过乘以相位匹配修正因子进行修正,从而更加通用和适用于兰姆波传播的总二次谐波场。数值计算结果表明,当双频兰姆波(DFLW)分量的相速度恰好或近似等于一次兰姆波分量的相速度时,二次谐波位移的幅值随着传播距离的增加而明显增大。
Within the second-order perturbation treatment, the present work analyzed the complex second-harmonic generation of Lamb waves in a two-layered solid waveguide by combining the modal analysis method and the nonlinear reflection of acoustic waves at interfaces. The formal solution of the second-harmonic field is obtained on the basis of the modal analysis approach, from which a phase matching modification factor can be determined. The solution of the cumulative second-harmonic displacement field derived from the nonlinear reflection of acoustic waves at interfaces can be modified by multiplying the phase matching modification factor, and then be more general and applicable for the total second-harmonic field of Lamb wave propagation. Numerical computation results show that amplitude of the second-harmonic displacement increases clearly with propagation distance when the phase velocity of a double frequency Lamb wave (DFLW) component is exactly or approximately equivalent to that of the primary Lamb wave pr...
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